George w



(No Model.)

G. W. SAWYER.

ELECTRIC LAMP.

No. 254,055. Patented Feb. 21,1882.

C l a jnvenzor.

N. PETERS. Phulo-Lllhugmphcr, Washington. 1;).(2v

UNITED STATES PATENT OFFICE.

GEORGE \V. SAVYER, OF NE\V YORK, N. Y., ASSIGNOR TO BERNARD LANDE, OFSAME PLACE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 254,055, dated February21, 18853.

Application filed November 29, 1881.

To all whom it may concern:

Be it known that. I, GEORGE W. SAWYER, of New York, county and State ofNew York, have invented certain new and useful improvements in ElectricLamps, of which the following is a specification.

This invention relates to electric-arc lamps, and has for its object tomake a simple and reliable feeding device, not liable to derange- IOment, for raising the upper carbon to form the are between the points ofthe carbons, and to allow the same to gradually feed down as the carbonsare consumed.

Thisinvcntion consists oftwo grooved pulleys fixed in yokes depending inbrackets from the lowersideoi'theelectro magneticdevice. These groovedpulleys have the upper-carbon rod between them, and are held thereto bymeans of springs so adjusted as regards strength that the carbon rodwill fall down freely by its own weight, turning the pulleys as it sodescends, butis held between the pulleys when they are prevented fromturning. Two brake-armsprojccting downward from the moving core orarmature of the electromagneticdevice partly surround the groovedpulleys. These brakearms are brought in contact'with the pulleys whenthe moving core or armature first commences to rise, and so look them byfriction,

0 and then the pulleys, with the carbon rod, move up with the movingcore or armature to form the are between the carbon rods. As the earbonsconsume, the magnetic action of the current passing through theelectro-magnet weak- 5 ens, the armature with the brakearms falls andreleases the pulleys, and so allows them to turn and the upper carbon toapproach the lower one. Said falling of the upper carbon is instantlyarrested by the brake-arms when the 40 are is of normal length. By thisarrangement it will be seen that the upper-carbon rod falls with aperfectly steady uniform motion, and is in no wise bruised or marred bythe grooved pulley, so the liability of the clamping devicebecominginoperative is reduced to a minimum.

The invention also consists in certain improvements in theelectro-magnet, which will be fully understood from the followingdescription of the accompanying drawings, to which (No model.)

I will now refer to more fully describe my invention.

Figure l is a vertical section of an electric lamp embracing myimprovements, showing the are formed between the carbon rods. Fig. 2 isa full front view of the clamping and feed- 5 ing device and itsactuating electro-magnets, showing the feeding device frcc. Fig. 8 is avertical section of the same cut through the line a; a0, and Fig. 4 is ahorizontal section cut through the line y y.

The electro-magnetconsists ofthetwohelices a a, the upper ends of whichare secured to the bar I) of the frame, made of insulating material, orto the iron plate 0, which is secured to the bar I), and which has twoshort cores, c c, fitting for a short distance down into the helices aa. Two other cores, (Z d, fit loosely in the helices a a, and areconnected together by the bar (1', fitted to slide freely on brackets c6, connected to the lower heads of the helices a a. The upper-carbon rodf passes through holes in the bar 1), plate 0, and bar (1. The electriccurrent enters the lamp by the bindingpost g, passes through the twohelices a and a, down by the flexible wire 9, to the lower end of thecarbon rod f, and down the carhon h, carried thereby, and the lowercarbon,

h, carried by the bar 7L2, of insulating material, up the side bar, 1 ofthe frame, and out of the lamp by the binding-post j. The elec- 8o triccurrent passing through the helices a and a causes the cores d (l toapproach the fixed short cores 0 0, so that this electromagnetic deviceis a combination of a horseshoe electro-inagnet and axial magnet, and bythis arrangement I have the long movement of axial cores with theadvantage of the more powerful attraction of magnets of the horseshoeform.

Passing through holes in the brackets c e are the necks of the yokes L,the upper ends of which are provided with light springs It" It, toinsure the yokes falling down, their limit of downward movement beinggoverned by the ends of slots in their sides coming in contact 5 withthe small screws 0 c in the brackets e c.

In the bifurcated ends of these yokes 7c 7c are pivoted the pulleys l 1,ground to fit the carbon rod f, and these pulleys Z Zare pressed againstthe rodf by means of the springs m m, tending to draw them together, theyokes 7c it being loosely fitted in the brackets e e, to allow of aslight movement of the yokes and pulleys Z Z.

Connected to the bar (1, joining the cores d (Z, are the two brake-armsn at, extending downward and partly surrounding the pulleys Z Z. Thesebrakearms are away from the pulleys when the cores (Z (Z are in theirlowest position so that the pulleys are free to be rotated by thefalling of the carbon rod f, the tension of the springs m at being suchas to cause the pulleys Z Z to rotate when the carbon rod f moveslongitudinally, and to hold the rod between them by friction when theirrotation is prevented, which occurs as soon as the brake-arms not comein contact with them upon the cores (Z (Z being attracted within thehelices (Z and a. The pulleys Z Z and the rod fare then raised uptheextent of such upward movement, which forms the are, this move mentbeing governed by the set-screws 00, passing through the bard andbutting against the heads of the helices (Z a. Instead of only twopulleys Z Z and their supporting-yokes and brakes, three or more may bearranged around the rodf, such a modification being easily arranged byany skilled mechanic; so a further description here of the same isunnecessary.

It is obvious that other forms of actuating electro-magnets may be usedin combination with this improved carbonaod clamping and feedingdevice.For instance, the plate 0, with short cores 0 0, may be removed, leavingthe magnet, as shown, an axial magnet of horseshoe form; or a singlestraight hollow-core axial magnet or an ordinary horseshoe-magnet withmoving armatures may be used.

It is also evident that any of the forms of electro-magnets having twoor more coils of wire connected upon the differential principle may beused; so Ido notwish to confine myself to the combination of theparticular form of electro-magnet here shown with the carbon-rodclamping and feeding device; but

What I claim, and desire to secure by Letters Patent, is-

1. An electric-arc-lamp regulator composed of thefollowinginstrumentalities in combination: friction guide-pulleysembracing the upper-carbon-holding rod, and the moving core or armatureof an electro -magnetic device provided with brake irms adapted toprevent the rotation of the guide-pulleys and raise them with thecarbon-holding rod clamped between them, when the core or armature isacted on by induction from the electric current passing through thecoils of the electroamtguctic device substantially as set forth.

2. In combination with the moving core or armature of an electromagnet,the brake-arms a 12, pulleys ,Z Z, fitted in verticallyslidin gbearings, and the carbon rod f, substantially as and for the purposehercinbeforc set forth.

3. In combination, the rodf,pnllcys Z Z, yokes k Ir, having slottednecks, brackets c 0, having set-screws c c, and brake-arms a a,connected to bar (1 of the moving cores (Z (Z, substantially as setforth.

4. The electro-magnetic device composed of the helices a, fixedconnected cores 0 c, and movable connected cores (Z (Z, in combinationwith the brake-armsn a, pulleys ZZ, yokes k 7:, and carbon rod f,substantially as set forth.

In testimony whereof I have hereunto set my hand, at New York, countyand State of New York, this 26th day of November, A.D. 1881.

' GEO. W. SAWYER.

Witnesses:

JOHN D. SHEDLOCK, H. D. WILLIAMS.

